Can I lose marks for using 4u theory in a 3u paper? (1 Viewer)

[jeffstar18]

So we did a 45 minute exam where one of the questions asked us to prove that cos4theta = sinsomething + sinsomething + sinsomething (can't remember the coefficients or the powers). You could just do it using double angle expansion, but during the exam I couldn't think of that so I ended up using de moivres theorem, but still got the right answer. The question was phrased as hence or otherwise prove. Can I lose marks?

 

[Omnipotence]

No. It's fine.

 

[Shadowdude]

It's fine, but if there's a "hence" in the question, there should be an easier less complicated way.

 

[billym]

Just be careful in how the question is worded. If they ask you to use a specific method, you will be deducted marks if you use a different method.

Also note that if a question states "Hence, .......", if you do not use the previous result the marker may have grounds to deduct marks.